How to download a Zip file into a Perticular Location

package FileDownloads;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxProfile;

public class FileDownload {

    public static void main(String[] args) throws InterruptedException {
        FirefoxProfile Prof = new FirefoxProfile();
        Thread.sleep(3000);
        Prof.setPreference("browser.download.dir", "D:\\java prj");
        Prof.setPreference("browser.download.folderList", 2);
        Prof.setPreference("browser.helperApps.neverAsk.saveToDisk","application/zip");
        WebDriver driver = new FirefoxDriver(Prof);
        driver.get("http://www.bcfi.be/download/");
        driver.manage().timeouts().implicitlyWait(3,TimeUnit.MINUTES);
        driver.findElement(By.xpath("//*[@id='datatable']/tbody/tr[3]/td[3]/form/input")).click();
    }

}